Radio receiving apparatus



June 1927. 1,631,993

G. W. WACKER RADIO RECEIVING APPARATUS Filed Aug. 17, 1923 HII F !muni I/N VENTOR Geox e W. Wack v /1 TTORNE Y Patented June. 14, 1927.

UNITED STATES PATENT OFFICE.

'GEORGE W.`WACKER, ,or NORTI- BERGEN, NEW JEBSEY, ASSIGNOR TO PAL RADIOCOMPANY, or 'NORTI-I nnwnmnnw JERSEY; A CORPORATION or NEW JERSEY.

RADIO REGEIVING AI'VPAR-ATUS.

Application filed August 17, 1923. Serial No. 657,906.

My present invention relates generally to a radio receving apparatus andmore particularly to one employing a rectifier of the crystal detectortype.

Among the more important Objects of my invention are: the provision in aradio receiving apparatus of a tuning coil made up oftwo connected butspaced sections; the provision in a radio receiving apparatus having atuning coil made up of spaced but connected sections, of a tuning membersupported in the space between two of such sections; the provision witha tuning coil made up of spaced but connected sections of a tuningmember arranged to act as a buzzer when in position between two spacedsections; the

'provision in a tuning apparatus of an armember can be discharged fromthe apparatus ,directly throughthe container without removing theapparatus from the container;

the provision with a container, ota receiving apparatus arranged to beremoved therefrom and replaced asa unit; the provision generally of anew and improved receiving apparatus and hook up.

For the attainment of these objects and suchother objects as will appearor be pointed o'ut hereinafter, I have illustrated one embodiment ,of myinvention in the drawp in gs Wherein i Figura l is a top View otmyapparatus With the cover m openposton;

Figure 2 is a vew'thereof in ,s de eleva- Figure 3: is a View taken inline 3-3 of Figure 2 lookingdown, in the direction of the arrows'; v i

F iguret is a vertical section taken on line 4% of Figure 3 alsolookingin the' directionof the arrows; i i Figure 5 s a sectonon lne 5-5 ofFig- 'ure 4 the arrows ndcatng the direction 111 ywhichthe sectionistalten; and

Figure' is a diagrammatic showing of my hook up.,

Upon viewing the various figures of the drawing it will be observed thatmy invent-ion includes generally a container 10 and a unit filler 11.

The container 10 may be of any desired or preferred Construction and isprovided with a top closure 12 to be held in a closed posi;- tion in anydesired manner as by the fastening; means 13 and 14.

This unit ller 11 eomprises generally the block 15 made of aninsulati;ag-material such as wood and of a length andwidth so as to itConveniently within the container 10 and yet permit of its ready removaltherefrom. This block 15. is preferably cut away on its upper surface asshown at 16 in Figurc this cut away being shouldered as shown at 17 soas to provide the stepped arrangement shown.

A conducting wire 18 is wound upon this block between the shoulders 19and 20, the resulting coil 18 having two of its adjacent turns apaced asubstantial distance apart to provide te space 21 (see Figure 3) thefunction of which` will be pointed out shortly. r

The wire 18 wound about the block 15, as described, forms the tuningcoil of a radio receiving apparatus and for tuning purposes there isprovided a lever or contact finger fixed to the post 23 for pivot-almovement therewith. This post 23 is carried from a face-plate 24, madepreferably of an insulated material such as fibre, the post 23 beingprovided at its upper end With the insulating knob 25 which has itslower end passing through the block 15. The ,iace-plate 24 is secured inposition on block 15 by means ot the posts 26 27, 28,- 29 each of whichis headed at one end 30' 'and threaded at the other end, the threadedend being each en- .ga ed by the clamping nut 30 to serve not 31 cuttherethrough ocentrally along and spaced from one side thereof andeXtending into' said opening are the bent up ends 32 and 33 of members34 and the former being Secured in position in any desired or preferredmanner as by a small nail or brad, and the latter being held inelectrical contact with the post 29; and for this pur" ose it isillustrated in Figure 5, as clampe' in position between the head of thescrew 29 and the block 15. A crystal of any desired or preterredcharacter is received within the opening 31 and is held in such openingby the spring fingers 32 and 33 for purposes that will shortly bepointed out.` The opening 31 may be radially enlarged as at 33' in whichenlargement is received the spring finger 33 whose gripping action willthus be increased v V An electrical 'conducting contact member 36,preferably L shaped, is supported from the nut 37carried by the post 28,the depending leg 36 of the contact member 36 being arranged to contactwith'rectifying Crystal 39 held in the opening 31 as described r above.This Crystal is of a type which will waves at radio frequency.

act as a rectifier in the presence of electrical Upon Viewing Figure 5it will be observed that the block 1519,' provided with a groove 40along one of its side faces through 'which passes a wire conductor 41having one ot its ends in electrical contact with the post 28 and itsother end in elect'rical contact with the post 27, preferably by beingafiixed to a metal platc 42 carried by and in 'contact with the post 27.Upon viewing Figure 4 it will be further `'observed that a spring member43 is ure 2 the post 27' is connected electrically with one end ofthe'tuning coil 18 by means of the wire conductor 45. A,

I show my hook-up in Figure 6, and as will be understood upon viewingthis figure, I. employ a`conductively coupled circuit. The antennac'circuit passes from the antenn'jae to the' lead 51, through the slide i52' to the coil 53 and then to the ground by :the leads 54 and 54'.

passes ,from the'eontaet member to the The detector circu'it lead 56 t'othe lead 54, eoil 53, slide 52 leads 57, 58 ear phones 59 lead 60 to theCrystal rectifier .61. i r

Upon viewin Figure 1 in which 'a top plan view of a ace-plate 24 can beobtained it will' be observed: that this face: late has ;marked 'upon'it the words Ground, Phbiie,

etc., to assist in hooking up the set as intended. It will be furtherobserved that the post 23 has attaehed to it above the face-plate thepointer 48 which coo rates with the indications 49 on the face-p ate soas to indicate the extent of tuning employed.

The post 275 is grounded in any desred or preferred manner as by beingwired to a radifntor or a water pipe and the post 26 is attached to orconnected with the antennae. This completes the antennae circuit fromthe antenna to the post 26 from the post 26 to and through the springmember 43 to the post 23 lover 22, tuning coil 18, lead 45 post 27 tothe gro'und. 'Phones are attached to the post 26 and` 29 to complete thedetector circuit' which passes from the tuner 18-22to the lead wire 45post`27 plate 42 conducting wire 41 post 28 contact member 36 Crystalmember 39, post 29, 'ear phones then back to the tuning apparatus. p i

When it is desired to tune in for receiving purposes the apparatus isfirst connected up, as already set forth'above, and the knob 25 turnedby hand to cause the downturned outcr end of the lever 22 to sweepacross the coil 18 so as to tune in nxore or less of the coil. Thismovement of the lover 22 to the left in Figure 3 is limited by the,shoulder 17, thus always keeping a pi'edetermined minimum portion of thetuning coil in cireuit. The movement of the leVer 22 in the oppositedirection is lin'ited by the shoulder at the other end. When the tuningmember 22 is in the position shown in Figure 2 i. e. in the space ,21between the portions of the coil ,and'out ot 'contact with the coils itserves Having thus described my invention and 1. In adevice of thecharacter described,

a tuning apparatus including spaced coils, a rotatable member positionedin the s ace between *the coils, means extending from (m'e end of saidmember for tuning the coil, and a conductorspring pressed into contactwith the other end.

` 2. In a device of the characterdescrbdfi. tuning apparatus comprisingan insulatin'g block having one face thereof cut aw spaced tuning. coilswound about the hice to position certain conductors thereof in said ,cutaway portion a member passin through and moyably ositioned in the blocbetween the coil's, an means on said member fin' tunin the coil.

' 3. f n a tuning a'ppar'atus of the character described, 'a supportingblock having ajpit of opposite parallel faces, one of said faces 'ha'vga 'transvrse recess' whose bottom presents a substantially fiat surface,'a tuni col hehoall y 'wound about the blck'n u manner which disposes aportion thereof along said fiat surface, and a tuning element mounted insaid block and arranged to be adjusted over said surface.

4. In a tuning apparatus of the character described, supporting blockhaving a pair of opposite parallel faces, one of said faces having atransverse recess whose bottom presents a substantially flat surface, atuning coil helically wound about the block in a manner which disposes aportion thereof along said fiat surface, and a tuning element nounted insaid block and arranged to be ad justed over said surface, said tuningelement comprising a. contact finger inovable over said surface.

5. In a tuning apparatus of the character described, a supporting blockhaving a pair of opposite parallel faces, one of said faces having atransverse recess whose bottom presents a substantially flat surface, atuning coil helically wound about the block in a manner which disposes aportion thereof along said fiat surface, and a tuning element mounted insaiclblock and arranged to be adjusted over said surface, said tuningelement comprising a contact fnger in said recess and arranged formovement over the portion of the coil disposed therein.

6. .In a tuning apparatus of the character described, a supporting blockhaving a pair of opposite parallel faces, one of said faces having atransverse recess whose bottom presents a subst'antially fiat surface, atuning coil helically wound about the block in a manner which disposes aportion thereof along said flat surface, and a tuning element mounted insaid block and arranged to be adjusted over said surface, said tuningelement comprising a contact finger in said recess and arranged formovement over the portion of the coil disposed therein, said fingerbeing pivotally mounted at one end thereof and arrangezl to permitmovement at the other end in an arcuate path between limits lefined bythe side walls of therecess.

7. In a tuning apparatus of the character described, a. substantiallyfiat supporting block having a mid-portion reduced in thickness, atuning coil helically wound about said mid-portion whereby at least oneportion of the coil will lie along a substantially fiat surface, and atuning element mounted in said block and comprising a contact fingermovable in a plane parallel to said surface and arranged to be adjustedover said surface.

8. In a tuning apparatus of the character described, insulating blockhaving one face thereof cut away to provide a recess having asubst-intially flat base, a tuning coil wound about the block toposition a portion thercof in said cut-away portion and in conformitvwith said base and tuning` means movably mounted in said recess.

In testimony whereof I have hereunto signed my name.

GEORGE W. lVAOKER.

